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how to control a dc motor from a cd-rom with an h-bridge RX-2B ? Answered

hi,, i'm new here and i'm new using arduino,,,  i have an arduino uno, and i have to make a project for a class in my university.i would like to know how to use a dc motor form a cd-rom, i have an h.bridge RX-2B, and i need to know how to control the direction of the motor with those components, i've found some information around, but using another h-bridge, so i'm not sure about the configuration of my circuit, i jus t need tha for the moment,,,  thanks?

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piles.of.spam
piles.of.spam

8 years ago

frollard has a terrific amount of info above on H bridges, which would solve your problem for a DC brushed motor, but generally CD-ROM motors are brushless, which means you need a 1/2 bridge on each pole, which you control independently. How many poles are there in your particular motor?
An RX-2B is an RC receiver decoder. Without the transmitter chip (TX-2B) it's not much use. Have you been assigned to use these parts specifically? Can you put up some more information? Interesting problem though!

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edwin0791
edwin0791

Answer 8 years ago

hey thanks for response,, about motor, it has two poles, what i want is to change the polarity to change the direction of the motor, i saw i need an h-bridge l293 or something like that, but i don't have one.
RX-2B is an h-bridge that i borrowed ,, so, this bridge is not useful for my problem???
I put some new picture of motor and the h-bridge,, thanks again for answer to my post, i'm really new in this and i don't know how to make the circuitry for this,, so if you can help me with it, i'll really appreciate it

IMG_0196[1].JPGIMG_0195[1].JPGIMG_0194[1].JPG
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frollard
frollard

Answer 8 years ago

I'm betting the cd-rom had an h-bridge on it to control this tray motor.

Either way, a quick search here on ibles shows LOTS of h-bridge options, circuits, and integrated chips.

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piles.of.spam
piles.of.spam

Answer 8 years ago

OH OK- it's a TRAY motor, not the one that spins the disc. So yeah, an Hbridge should work fine. However, I don't think the RX-2B is an Hbridge, rather, I think it's a 5 function receiver chip intended for something like RC cars- it'll give you signals, but not motor drive current.
http://www.digchip.com/datasheets/parts/datasheet/433/RX-2B-pdf.php

An Hbridge would be something like:
http://www.sparkfun.com/products/315

and here's how to use it:
http://itp.nyu.edu/physcomp/Labs/DCMotorControl

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frollard
frollard

8 years ago

an h-bridge is a group of transistors that acts like a double pole double throw switch...

by controlling the transistors so that 2 are + connections, and 2 are - connections -- by reversing the poles you reverse the turn of the motor. You have to take VERY careful precautions to make sure you don't ever allow the transistors to directly connect + to - (since they are capable of it) The drawing I attached is a DPDT switch, and the 2 armatures are physically connected so they move at the same time...but imagine if you connected Btop to A and Bbottom to C (transistors can do that since there is no physical restriction on how you turn them on and off) -- you would have a direct short from B-A, A-C, C-B and it would asplode.

dpdt.PNG
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edwin0791
edwin0791

Answer 8 years ago

thanks for the info... i understand better now how works an h-bridge,, but i need help to know how to use it, and make the circuit... up there i put some pictures of the motor,, thanks again for your reply